Yellow acridin dye and process of making same.



No. 730,771. Patented June 9, 1903.

UNITED STATES PATENT @EFICE.

KARL JEDLICKA, OF BASLE, SWITZERLAND, ASSIGNOR TO THE FIRM OF SOCIETY OF CHEMICAL INDUSTRY IN BASLE, OF BASLE, SWITZERLAND.

YELLOW ACRIDIN DYE AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent N 0. 730,771, dated June 9, 1903.

Application filed August 6, 1902. $eria] No. 118,599. (Specimens) To all whom it may concern).- tion is decanted in an open vessel, and there Beit'known that I, KARL JEDLIOKA, ehemis added directly to the solution while stirist and doctor of philosophy, a citizen of the ring ten kilos of acetic aldehyde of ninety- Swiss Republic, and a resident of Basle, five percent. strength. The mixture grows Switzerland, have invented new and useful warm from'itself to to 70 centigrade, and 55 Improvements in Yellow Acridin Dyes and the acetic alhehyde has disappeared after a Processes of Making Same, of which the folfew minutes. The mixture is then heated for lowing, is a full, clear, and exact specificaabout one hour at 80 to 90 centigrade, dition. luted with about two hundred liters of Water, to In Letters Patent No. 537,723, dated April filtered, and the dyestuff salted out from the 6o 16, 1895, is described the transformation of filtrate with common salt and zinc chlorid. the sparingly-soluble yellow acridin dyestuffs The dried dyestuff is a brown powder easily known as acridin yellow and benzoflasoluble in cold water to an orange-yellow so- Vin into easily-soluble products of more redlution. The dilute aqueous solutions of it 15 dish tint, the process being based on the treathave an intensely yellow-green fluorescence. ment of the said amidoacridins with alkyliz- Alkali precipitates the color base as yellow ing agents. I have now found that the same flocks. In concentrated sulfuric acid the dyeeffect namely,thetransformationintoeasilystuff dissolves to a reddish-yellow solution of soluble dyestuffs of more reddish tintsyellow-green fluorescence. It is difficultly 20 may also be produced by treating the leueo soluble in cold alcohol to an orange-yellow compounds corresponding to the said amidosolution having an intensely yellow-green acridins in the form in which they are obfluorescence. It is insoluble in ether and tained by heatingatetraamidoditolylmethane benzene. Cotton mordanted with tannin and base with dilute acid under pressure in-soluleather are dyed by this dyestuff clear yel- 5 tion in water and in the presence of mineral low-orange tints.

acids, especially of hydrochloric acid with If in the foregoing example diamidoditolylacetic aldehyde. The new dyestuffs thus obphenyldihydroacridin (leueo compound cortained differ from the amidoacridins (acridin responding to the benzoflavin) is substituted yellow, benzoflavin, c.) derived from the for the diamidoditolyldihydroacridin, a dye- 30 same leueo compounds, besides being of more stuff is obtained which has similar properties, 80

reddish (yellow-orange to reddish -orange) but of a more reddish tint. tint by being already soluble in cold water. It has also been found that the same dye- To manufacture these new dyestuffswhich stuffs, easily soluble in cold water, are obare particularly suitable for dyeing leather, tained by substituting for the leueo com- 35 the procedure is as follows: Forty kilos of pounds corresponding to the amidoacridins 8 metatoluylenediamin are dissolved in fifty the previously-prepared amidoacridins themliters of water,togetherwith thirty-eight kilos selves, (acridin yellow, benzoliavin, 850.) of hydrochloric acid of thirty per cent. Such amidoacridins may be directly treated strength. Twelve kilos of formaldehyde of in suspension in water and in the presence of 40 forty per cent. strength are added, and the a mineral acid with acetic aldehyde. In this mixture is allowed to stand for some hours. case the production of the dyestuif is carried Then a further forty kilos of concentrated out as follows: One hundred kilos of the color hydrochloric acid are added, and the whole is base of acridin yellow (diamidoditolylacridin) heated in an autoclave for about six to eight are suspended in eight hundred liters of wa- 5 hours at to centigrade in order to ter containing ninety kilos of hydrochloric 5 transform the tetraamidoditolylmethane into acid of thirty per cent. strength. Thirty-five diamidoditolyldihydroacridin. After cooling kilos of acetic aldehyde of fifty per cent. the content of the autoclave which contains strength (one molecular proportion) are addthe hydrochlorate of the leueo compound cored, and the mixture is heated with open steam 5o responding to the acridin yellow in soluto 80 to 90 centigrade. The acridin yellow mo gradually dissolves, and the resulting solution has a dark orange color. The solution is allowed to cool, filtered, and the new dyestulf is precipitated from the filtrate by addition of common salt and some zinc chlorid.

This dyestufi is identical with the described dyestutt' derived from leuco compound correl brown powder, easily soluble in cold water,

sponding to .acridin yellow.

What I claim is 1. The herein-described process for the manufacture of orange dyestufts by treating the leuco compounds corresponding to the amidoacridins with acetic aldehyde (OH CHO) in L and mordanted cotton orange shades,substantially as described.

3. As a new article of manufacture the herein-described orange dyestuiiwhich can be obtained by treating the lenco compound corresponding to acridin yellow with acetic aldehyde and appears, in dry state, as a reddishwith an orange color and greenish-yellow fluorescence difficultly soluble in cold alcohol,

insoluble in ether and benzene, soluble in danted cotton clear orange shades, snbstantially as described.

In witness whereof I havehereunto signed my name in the presence of two subscribing witnesses.

KARL JEDLICKA.

Witnesses:

GEORGE GIFFORD, ALBERT VICTOR GRAETER. 

